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<div class="subTitle">org.opencv.features2d</div>
<h2 title="Class BOWImgDescriptorExtractor" class="title">Class BOWImgDescriptorExtractor</h2>
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<li>java.lang.Object</li>
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<li>org.opencv.features2d.BOWImgDescriptorExtractor</li>
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<pre>public class <span class="typeNameLabel">BOWImgDescriptorExtractor</span>
extends java.lang.Object</pre>
<div class="block">Class to compute an image descriptor using the *bag of visual words*.

 Such a computation consists of the following steps:

 1.  Compute descriptors for a given image and its keypoints set.
 2.  Find the nearest visual words from the vocabulary for each keypoint descriptor.
 3.  Compute the bag-of-words image descriptor as is a normalized histogram of vocabulary words
 encountered in the image. The i-th bin of the histogram is a frequency of i-th word of the
 vocabulary in the given image.</div>
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<td class="colFirst"><code>static <a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html" title="class in org.opencv.features2d">BOWImgDescriptorExtractor</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html#Z:Z__fromPtr__-long-">__fromPtr__</a></span>(long&nbsp;addr)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html#compute-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-org.opencv.core.Mat-">compute</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
       <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
       <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;imgDescriptor)</code>&nbsp;</td>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html#descriptorSize--">descriptorSize</a></span>()</code>
<div class="block">Returns an image descriptor size if the vocabulary is set.</div>
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<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html#descriptorType--">descriptorType</a></span>()</code>
<div class="block">Returns an image descriptor type.</div>
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<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html#getNativeObjAddr--">getNativeObjAddr</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html#getVocabulary--">getVocabulary</a></span>()</code>
<div class="block">Returns the set vocabulary.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html#setVocabulary-org.opencv.core.Mat-">setVocabulary</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;vocabulary)</code>
<div class="block">Sets a visual vocabulary.</div>
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<h4>__fromPtr__</h4>
<pre>public static&nbsp;<a href="../../../org/opencv/features2d/BOWImgDescriptorExtractor.html" title="class in org.opencv.features2d">BOWImgDescriptorExtractor</a>&nbsp;__fromPtr__(long&nbsp;addr)</pre>
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<h4>compute</h4>
<pre>public&nbsp;void&nbsp;compute(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                    <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
                    <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;imgDescriptor)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>imgDescriptor</code> - Computed output image descriptor.
     pointIdxsOfClusters[i] are keypoint indices that belong to the i -th cluster (word of vocabulary)
     returned if it is non-zero.</dd>
<dd><code>image</code> - automatically generated</dd>
<dd><code>keypoints</code> - automatically generated</dd>
</dl>
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<h4>descriptorSize</h4>
<pre>public&nbsp;int&nbsp;descriptorSize()</pre>
<div class="block">Returns an image descriptor size if the vocabulary is set. Otherwise, it returns 0.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>automatically generated</dd>
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<h4>descriptorType</h4>
<pre>public&nbsp;int&nbsp;descriptorType()</pre>
<div class="block">Returns an image descriptor type.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>automatically generated</dd>
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<pre>public&nbsp;long&nbsp;getNativeObjAddr()</pre>
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<h4>getVocabulary</h4>
<pre>public&nbsp;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;getVocabulary()</pre>
<div class="block">Returns the set vocabulary.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>automatically generated</dd>
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<h4>setVocabulary</h4>
<pre>public&nbsp;void&nbsp;setVocabulary(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;vocabulary)</pre>
<div class="block">Sets a visual vocabulary.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>vocabulary</code> - Vocabulary (can be trained using the inheritor of BOWTrainer ). Each row of the
     vocabulary is a visual word (cluster center).</dd>
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<p class="legalCopy"><small>Generated on 2023-06-28 12:47:21 / OpenCV 4.8.0</small></p>
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